SU1252745A1 - Device for checking magnetization of permanent magnets - Google Patents

Abstract

The invention relates to magnetic measuring instruments and can be used to control the magnetization of ferromagnetic materials, in particular permanent magnets of electric machines. The purpose of the invention is to ensure the reliability and operability of monitoring the magnetization of each magnet installed in the stator of an electric machine by extracting magnetic flux through the stator body, this is achieved by steaming each magnetic pole of the sample under study separately. For this, the number of shunts is equal to iibJM 2p-1, where 2p is the number of stator poles. The device contains pariare supports 1, with ferromagnetic substations 2.1–2.5, stator 3, permanent magnets 4.1–4.6, forming magnetic poles of the electrical matina, inductor 5. Upon completion of magnetization and its control, dielectric hinges 1 with ferro-magite } The tunnels are retracted to the sides, and the stator is removed from the inductor, 13. F. f., 2 ill. with (L "} it h g ki 4J" V "J k" 5

Description

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The invention relates to magnetic HbJM measurements and can be used to control the magnetization of ferromagnetic materials, in particular permanent magnets of electric machines.

The purpose of the invention is to ensure the reliability and operability of controlling the magnetization of each magnet installed in the stator by removing the magnetic flux through the stator body, which is achieved by ensuring that each sample pole is examined separately.

FIG. 1 shows a device for controlling the magnetization of permanent magnets located inside the stator of a six-pole electric machine; general view; in fig. 2 shows the layout of magnets, shunts and magnetically sensitive sensors for the first stage of magnetization control.

The device (Fig. 1) consists of dielectric hinge bearings 1 with 2.1-2.5 ferromagnetic shunts adjacent to the outer wall of the stator 3. Inside the stator 3 there are permanent magnets А.1 - А.6 (Fig.2) forming the electric magnetic poles. machines, the number of which is 2p (an example of the device is considered for a six-pole machine). The stator 3 is clad on the inductor 5 with which magnets A.I - 4.6 are magnetized. The number of shunts is 2p-1, of which one shunt is 2.1 supporting with magnetic resistance R ,, the remaining shunts 2.2-2.5 are measuring with magnetic resistances respectively Rj - R5.

The ends of measuring shunts with magnetosensitive sensors are placed on the stator 3 on magnetic poles of magnets 4.1 - 4.4, the other ends of ET1GH shunts are located on the stator 3 between the magnet) 1 poles. The ends of the optic 2.1 are located on the stator 3 on magnetic poles of magnets 4.5 and 4.6, shunt section of the stator wall between these magnets.

The magnetic resistance R. of the supporting shunt 2.1 is significantly less than the magnetic resistance of the shuntable portion of the stator wall, i.e. (Rq.c and measuring shunts 2.2 12527452

2.5 are selected in such a way that their magnetic resistances are in the following dependencies:

K, R,: K,

 R, R

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All shunts 2.1–2.5 have a magnetically sensitive sensor on one of their ends, 6.1–6.5 sensors. Sensors 6.1 - 6.5 are connected to the block of the electronic system of rejection of magnets, rebuilt by the electrical signal of the sensor, equivalent to the magnetic flux of one suitable reference magnet. Sensor 6.1 is connected to two other blocks of the electronic rejection system, one of which is rebuilt by an electrical signal equivalent to the total magnetic flux from two standard valid magnets, the other block is rebuilt by an electric signal equivalent to the total magnetic flux from two standard rejected (nonmagated a) magnets.

The device works as follows.

When installing the stator 3 on the inductor 5, magnetic pogunts 2.1-2.5 on the dielectric supports 1 are retracted to the side (Fig. 1). Magnets 4.1 - 4.6 of the stator 3 are magnetized, then the magnetic shunts 2.1-2.5 are brought close to the outer wall of the stator by means of dielectric hinged supports 1.

Due to the fact that each of the measuring shunts, together with a certain part of the magnetic stator circuit, creates the lowest resistance loop for a particular magnetic flux created in the stator body by a corresponding magnet, from the entire set of total magnetic fluxes from each of the pairs of adjacent magnetic poles, magnetic fluxes from the total magnetic flux each of the magnets constituting a pair. Therefore, the magnetic fluxes of magnets 4.1–4.4 are closed through the corresponding sections of the stator wall 3 and shunts 2.1–2.5, which have 6.1–6.5 magnetically sensitive sensors at one end. The electrical signals taken from these sensors are matched in a block of the electronic rejection system with a conventional reference value. If the value of EMF is

One of the sensors is not less than the conventional reference value, then the A.I - 4.4 HaMarHjmenb magnets are normal, if less, then the magnets are magnetized insufficiently, their magnetization must be repeated or the magnets themselves must be replaced

The magnetic flux, coax 1 1 1 with a pair of magnets 4.5 - 4.6, is clamped through the walls of the stator 3, the inductor 5 and the onopjiHfl shunt 2,} with a magneto-sensitive sensor 6.1. The electrical signal from sensor 6.1 in the electronic rejection system blocks is compared with the conventional reference values of the signals from two reference usable and two reference rejected magnets. the EMF value of the sensor 6. is not less than the conventional reference EMF value from the two standard valid magnets, then the magnet1 1 4.5 and 4.6 is magnetized. Normally, and the magnetization control operation is completed. If the EMF value of the sensor 6.1 is not more than the conventional reference value from the two reference defective magnets, then the magnets 4.5 and 4.6) are inadequately insufficient, their magnetization should be twisted or replaced by the magnets themselves.

In the case when the EMF is counterplugged — MOi o of sensor 6. I is greater than the conventional reference value from two reference defective magnets, but less than the conventional reference magnitude from two reference valid magnets, the control circuit continues as follows. Shunt 2.1 is retracted from the wall of the stator 3, and sensor 6.2, in the case of a validity of the magnet 4.1, is connected to the comparison unit of the electronic rejection system according to the conventional reference value from two x 1 1 matrices.

If the EMF sensor of 6.2 is smaller than the conventional reference value of EMF from two valid reference magnets, the magnet 4.6 is magnetized insufficiently, and the magnet 4.5 is normal. If the EMF value of sensor 6.2 is not less than the conventional reference value of EMF from two valid reference magnets magnet 4.6 is magnetized normal and magnet 4.5 is not enough.

When the magnet 4.1 is magnetized insufficiently, the sensor 6.2 is connected to the unit of comparison of the electronic rejection system, rebuilt according to the condition

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If the magnitude of the EMF of the sensor 6.2 is less than the conventional reference value of the EMF from two reference defective magnets, the magnet 4.6 is magnetically short of failure. magnet 4.5 is normal. If the EMF value of sensor 6.2 is not less than the conditional reference value of the EMF from two reference defective magnets, the magnet 4.6 is magnetized normally, and the magnet 4.5 is not enough.

The conclusion about the magnitude of the magnet 4.5 can be made based on the fact that the mentioned options are described in the case when 1 pair of 4.6 and 4.5 maits are not sufficiently magnetized. Thus, a certain year of the magnet 4.6, bffj can make a benefit on the quality of the magnet 4.5.

According to d) konchapr and magnetizing and its control, the dielectric tarnier-) me of support 1 with ferrom-magnet1.1 shunts is retracted to the sides, and the stator 3 is removed from inductor 5,

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1. Control device for permanent magnetizers, containing-) with 1 & 2 pg magnets in the pole frame, schupt, made of a ferromagnetic material with two ends of measuring ρptelyp.gm element H);) the first of tortos, About tl and h a b: y t t so that, in order to ensure the authenticity (. i: ti and ogi; тив rativnost control, the number of ITON is equal to 2p-1, where 2p is the number With a STVO st. Iggg) of the stator, one of the 11 тов} 1t supporting, 11r1 than the support shunt with its thorium, set up opposite two rows of the fixed} mag (1H stator, first T () rsi with measuring 3neMC} iTOh Kji ci TO in the remaining navels ycTaHoHJ (; n opposite corresponding to 01 (the stator magnet’s stator magnet, and the second end of the stator eAly magppt.p1, and mpg) subject to correlation

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- magnetic s.g resistance of the reference iiiyiri l;

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R., ..., Rg - magnetic resistances 2. The device according to claim 1, about tl and other shunts, often because the shunts of us- Rjt- magnetic resistance are mounted on the dielectric hinge-section of the stator wall.

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Editor O. Bugnr Order 4619/47

Compiled by A.Diveev Tehred i.Ver “with

Corrector

Circulation 728 Subscription

VNIISH State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing enterprise, Uzhgorod, Projecto st., 4

1

Proofreader A | 3imokos

Claims (2)

F · rmula and sampling 1. A device for monitoring the magnetization of permanent magnets, containing a stator with permanent magnets in the form of poles, a shunt made of staple-shaped ferromagnetic material with two ends and a measuring element on the first of the ends, which is further that, in order to ensure the reliability and efficiency of control, the number of shunts is chosen equal to 2p-1, where 2p is the number of stator poles, one of the shunts is support, and the support shunt is installed with its ends opposite two adjacent stator magnets located, the first end with . measuring element k; the gray of the remaining shunts is installed opposite the corresponding stator magnet, and the second end is between the stator magnets, and the magnetic resistances of each shunt and the stator wall section obey the relation R | ^< R ",,, <R" R,. where R _d is the magnetic resistance of the reference shunt; s R _t , ..., R _s are the magnetic resistances of the remaining shunts; Rye - magnetic resistance of the stator wall section. 2. The device according to claim 1, wherein the shunts are mounted on dielectric hinged · 5 supports.